Cockring 3-Pack Black titus Silicone Series is very easy to use and very discreet. The silicone rings have a relatively high tensile force and can be turned up to twice their diameter. The diameter of the 3 cock rings is 25mm, 30mm and 35mm. This means that the 30 mm cock ring can be stretched up to 60 mm. Thanks to the different sizes, you can vary the pressure and thus improve your erection. After use, the rings return to their original shape.